Drafting instrument.



H. WILMS.

DRAFTING INSTRUMENT.

APPLIOATIONIILED rmms, 1911.

Patented Aug. 8, 1911.

INVENTOR COLUMBIA PLANOGRAPM 50-, WASHINGTON, D.

HERMANN WILMS, OF EAST PITTSBURG, PENNSYLVANIA.

DRAFTING INSTRUMENT.

Specification of Letters Patent.

Patented Aug. 8, 1911.

Application filed February 16, 1911. Serial No. 608,901.

To all whom it may concern:

Be it known that I, HERMANN WVILMs, a subject of the Emperor of Germany,residing at East Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inDrafting Instruments, of which the following is a specification,reference being had therein to the accompanying drawing.

This invention relates to an attachment for T-squares andstraight-edges, and the primary object of the invention is to furnish aT-square or straight-edge with an adjustable scale or graduated rulethat can be easily and quickly shifted to determine a measurement,thereby facilitating the work of a clraftsman by always having the scaleor rule in proximity to the work and in proper alinement with theT-square or straight-edge in connection with which it is used.

A further object of the invention is to provide a small and inexpensiveattachment of the above type that is adjustable to various Widths ofsquares or straight-edges in connection with which it is used.

l/Vith these and other objects in view the invention resides in a novelconstruction to be hereinafter specifically described and thenparticularly claimed.

Reference will now be had to the drawing wherein Figure 1 is aperspective view of the attachment. Fig. 2 is the enlarged top plan ofthe attachment. Fig. 3 is a bottom plan of the attachment, and Fig. 4 isa cross sectional view on the line 4 l, Fig. 2 on a somewhat reducedscale.

The reference numeral 1 denotes a skeleton frame secured by screws orother fastening means 2 to a straight-edge or rule 3 intermediate theends thereof, said frame extending rearwardly from the top of the ruleand having the outer end thereof provided. with longitudinal oppositelydisposed guide flanges 4 formed by bending upwardly and inwardly theedges of the frame 1.

Slidably mounted upon the rear end of the frame 1 between the guideflanges 4 is a clamping member 5, said member having the inner endthereof provided with a longitudinal slot 6 and extending through saidslot is a screw 7, carried by the frame 1.

Rotatably mounted upon the upper end of the screw is a nut or head 8that can be ad justed to frictionally grip the member 5 and hold saidmember relatively to the frame 1. The rear end of the-member 5 isprovided with a depending transverse flange 9 and secured to the innerside of said flange, as at 10 is one end of a flat spring 11.

The frame 1 is adapted to rest upon a suitable support, as a T-square 12and said frame is frictionally. held in engagement with the T-square bythe spring 11 engaging the rear edge 13 of the T-square. The rule orscale 3 will be supported at the front edge of the T-square and theattachment can be easily shifted longitudinally of the T-square. Theadjustment of the member 5 upon the frame 1 permits of the attachmentbeing used upon T-squares or straightedges of various widths, and theadjustment of the member 5 will compensate for any weakness in thetension of the spring 11.

The frame 1 and the member 5 are cut away and of skeleton form to reducethe weight of the attachment and the cost of manufacture. The attachmentcan be made of light and durable material and applied to any rule, scaleor straight-edge.

What I claim is 1. A device for the purpose set forth comprising aframe, a scale attached to one end thereof, guide flanges carried by thesides of the frame, an adjustable clamping member slidably mountedbetween said flanges and upon said frame and having a centrallydisposedlongitudinally-extending slot, said member projecting beyond the rearend of said frame, a depending flange carried by the projecting portionof said member and extending parallel with and depending below the endof said frame, a bow-shaped spring having one end thereof secured to theinner face of said flange, a screw carried by the frame and projectingthrough said slot, and a nut mounted upon the screw and engaging saidmember for maintaining it in an adjusted position.

2. A device for the purpose set forth comprising a frame, a scaleattached to one end thereof, guide flanges carried by the sides of theframe, an adjustable clamping member slidably mounted between saidflanges and upon said frame and having a centrally-disposedlongitudinally-extending slot, said member projecting beyond the rear Intestimony whereof aflix my signature end of said frame, a dependingflange car in the presence of two wltnesses. ried by the PIOJQCLlIlgportlon 0f sald meni- HERMANN VVILMS her and extending parallel with anddepending below the end of said frame, and Witnesses:

means for maintaining said member in its MAX H. SROLOVITZ, adjustedposition. KARL H. BUTLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

